We were lucky enough to be there in mid-season and thus enjoyed a tour of the grotto with just 3 of us. The guide was very knowledgeable and enthusiastic and we were able to see the cave drawings in great detail - something that might not be the case in high season.
Apparently the number of visitors is limited to 700 a day, so if you plan to visit in July and August, it's probably best to pre-book.
The drawings are very impressive and numerous. Mammoths, horses (with very small heads!), bison, even people, a fish...
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